<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="UTF-8" />
		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
		<title>v-计数器</title>
	</head>
	<body>
		<div id="app">
			<h2>当前计数：{{counter}}</h2>
			<button @click="add">+</button>
			<button @click="sub">-</button>
		</div>
		<script src="../lib/vue.js"></script>
		<script>
			let vm = new Vue({
				el: "#app",
				data: {
					counter: 0
				},
				methods: {
					add() {
						this.counter++;
					},
					sub() {
						this.counter--;
					}
				}
			});
		</script>
	</body>
</html>
